The Questionable Health Data Behind EPA’s Costly New Ozone Rule

NOTE: This report can also be downloaded here.

This week, the U.S. Environmental Protection Agency will begin conducting public hearings on its proposal to implement a stricter standard on ozone – a rule that the National Association of Manufacturers has called “the most expensive regulation ever imposed on the American public.” To justify the rule, EPA has made a number of claims about the health impacts from ozone exposure, arguing that its proposed rule will actually deliver billions of dollars in net benefits.

Given the significance of this proposed rule, which the New York Times says “would come with a high cost to industry,” it’s important to dig a little deeper into the basis on which the EPA is justifying the new standard. A review of the data suggests that EPA may have inflated the benefits of its proposed rule and downplayed the costs, which could ultimately translate to less American energy production and increased costs for U.S. manufacturers.

What is Ozone?

Ground-level ozone, also known as smog, is formed when volatile organic compounds (VOCs) and nitrogen oxides (NOx) interact with sunlight. The Texas Commission on Environmental Quality has said that “NOx emissions are a more vital or limiting component than VOC emissions in ozone formation,” although the relative importance of each compound may vary in different parts of the country. An array of industrial activities emit NOx and VOCs, although many regulators have identified tailpipe emissions from cars and trucks as the main cause of smog. The federal Clean Air Act gives EPA the authority to set National Ambient Air Quality Standards (NAAQS) for a range of pollutants, including ozone.

The Clean Air Act provides for states to be the regulators to attain the NAAQS. In areas classified as “nonattainment,” there are additional permitting requirements for activities that result in emissions, which include but are certainly not exclusive to oil and natural gas production. Additionally, if a company wishes to expand the industrial base of a region in nonattainment, the Clean Air Act requires that it implement costly “offsets” to ensure its emissions are not pushing the region further out of attainment. Thus, nonattainment status can present a barrier to new investment, since new economic activities will be far costlier than in areas that have already achieved attainment.

In 1997, the EPA set the ozone standard at 84 parts per billion (ppb), and then reduced it in 2008 to 75 ppb. Unfortunately, many parts of the country have been unable to achieve EPA’s existing ozone requirement. Additionally, several major metropolitan areas are still out of attainment with EPA’s higher, 1997 standard. What this means is that a new, lower ozone standard could ward off new investment — and potentially even drive existing operations out of certain areas.

Suspicious Health Data

Cass Sunstein, President Obama’s former administrator of the White House Office of Information and Regulatory Affairs, has written that economic costs do not form the basis for NAAQS. “Under the Clean Air Act,” Sunstein wrote last month, “national ambient air quality standards must be based on public health, not on cost-benefit analysis.”

Not surprisingly, the EPA argues that new ozone regulations will significantly improve public health, “based on extensive scientific evidence,” according to the Agency. Although Sunstein said that EPA does not have to justify the rule based upon costs and benefits, the Agency does argue that the value of the rule’s benefits — which the EPA categorizes as “avoiding asthma attacks, heart attacks, missed school days and premature deaths” — far exceeds the billions of dollars that the agency admits the rule will cost.

Moreover, Executive Order 13563 – signed by President Obama on January 18, 2011 – decreed that new regulations “must take into account benefits and costs, both quantitative and qualitative.” As the President wrote of that policy in the Wall Street Journal that same month:

“But creating a 21st-century regulatory system is about more than which rules to add and which rules to subtract. As the executive order I am signing makes clear, we are seeking more affordable, less intrusive means to achieve the same ends—giving careful consideration to benefits and costs.” (emphasis added)

Indeed, there is a monetary value to improving health, and the “public health” basis is certainly incorporated into EPA’s overall cost-benefit analysis. Thus, it’s possible to understand the public health basis for EPA’s new ozone rule by looking at how the Agency determined the monetary value of the tighter standard.

According to a fact sheet released by the EPA, lowering the ozone standard to 70 parts per billion (ppb) — down from the current 75 ppb — would deliver benefits valued at between $6.3 billion and $13 billion, but would cost $3.9 billion, creating “net benefits” of between $2.4 billion and $9.1 billion. If the standard were set at 65 ppb, EPA estimates that the costs would jump to $15 billion, but the benefits would also increase to between $19 billion and $38 billion.

Importantly, the EPA is also accepting comments on a standard as low as 60 ppb, although the Agency did not include that threshold in its economic assessment, owing to “increasing uncertainty in the scientific evidence at lower ozone concentrations.” The EPA noted that this uncertainty “reduces confidence that ozone standard levels below 65 ppb will result in additional health improvements” relative to the 65-70 ppb range.

The Agency’s net benefit numbers, however, are dramatically higher than what the same EPA estimated just a few years ago.

In 2011, when the EPA proposed a 70 ppb standard, its median “net benefits” estimate for a 65 ppb standard was only $700 million, with a high possibility that the costs could outweigh any benefits. Those also included “co-benefits” of reducing particulate matter, or PM2.5, meaning the benefits of the ozone reductions alone would be less than what EPA presented. Here’s the chart that accompanied EPA’s 2011 proposal, as part of its final regulatory impact analysis (RIA):


In 2011, EPA estimated that the costs and benefits of a 65 ppb ozone standard were essentially equal. But three years later, the agency claimed the benefits of the exact same standard exceeded the costs by more than $4 billion. SOURCE: EPA

In fact, Cass Sunstein later admitted that the 2011 proposal was by no means an economic winner, which was a key reason for the White House telling EPA to reconsider the proposed rule:

“…the public-health benefits — mostly reflecting the monetized value of deaths and illnesses prevented — of a new ozone regulation would have been significant and, by the EPA’s estimates, in the same general vicinity as the costs (at least at 70 ppb). But on some of the agency’s estimates, the net benefits would have been zero. Moreover, a strong majority of the benefits would have resulted not from ozone reductions but from ‘co-benefits’ — reductions in particulate matter, which come as an incidental benefit of the technologies that reduce ozone emissions.” (emphasis added)

But in 2014, the EPA changed its mind, claiming net benefits of a lower ozone standard are now as high as $23 billion – a 3,100 percent increase in net benefits for the exact same standard.

So, what explains the change?

In its “Ozone and Health” fact sheet, the EPA says it “examined thousands of scientific studies” before proposing the new rule, including “more than 1,000 new studies published since EPA last revised the standards in 2008.”

But the fact sheet says nothing of the 2011 RIA, much less the scientific studies that were used to justify its previous claims about benefits and costs.

Could it be that EPA was able to review a significant quantity of reports published since 2011 that better established the health benefits of a 65 ppb standard? Perhaps, but it would be difficult to make that claim based upon a review of the scientific references in EPA’s final Health Risk and Exposure Assessment for Ozone, which was published in August 2014.

There are 263 reports and studies listed in the reference sections of that Assessment. But nearly 70 percent of those sources were published prior to 2011, meaning they were part of the broader scientific understanding of ozone when EPA determined the net benefits from a 65 ppb standard were essentially zero. Moreover, many of the sources published during or since 2011 are literature reviews from EPA, which examine research published in previous years.

Curiously, as William Yeatman at the Competitive Enterprise Institute has observed, much of the “science” behind EPA’s latest ozone proposal was actually developed by the EPA itself. The Clean Air Scientific Advisory Committee – whose review of the latest science is what informed EPA’s public health basis for the new ozone rule – actually endorsed a 60 ppb standard, or 5 ppb lower than what EPA is even considering. As one might suggest, if a 60 ppb standard could be justified scientifically, then a 65 ppb or even 70 ppb standard could be seen as merely a “moderate” approach.

But as Yeatman details, the story is far more complicated:

“Given the stakes, you’d think EPA and CASAC would rely on only the latest, most independent science, right? Alas, that isn’t the case. Instead, all of the clinical studies cited by CASAC in support of the 60 ppb standard were created by the EPA—the organization that proposed the limit. Thus, the science on which the economy’s fate hinges suffers from a troubling absence of independence. Moreover, all of the non-EPA literature (on health impacts of 60 ppb ozone) cited by CASAC does NOT support a 60 ppb standard.” (emphasis added)

It is altogether possible that the EPA reviewed “more than 1,000 new studies” that were published since EPA’s 2008 ozone standards were finalized. But many of those studies were available — and presumably also reviewed — in 2011 when EPA said the 65 ppb ozone standard came with a far higher price tag than it does now. And if the EPA is relying on its own research to justify its rules, then why even bother with an “independent” body to review the available scientific literature?

Also troubling is that, in 2011, EPA admitted that its cost estimates for new ozone standards “assume a particular trajectory of aggressive technological change,” meaning the Agency had assumed compliance would come quicker and cheaper than a typical baseline scenario might suggest. As EPA further noted:

“An alternative storyline might hypothesize a much less optimistic technological trajectory, with increased costs, or with decreased benefits in 2020 due to a later attainment date…” (emphasis added)

If compliance required “aggressive technological change” with “optimistic” assumptions to make the 65 ppb ozone standard barely break even in terms of net benefits, then it’s possible — and indeed likely — that a more reality-based set of assumptions would show the rule actually imposing a net cost on the economy. Yet in EPA’s latest proposal, the Agency makes it appear as if the exact same standard now delivers greater health benefits — by several orders of magnitude.

Negative Impacts on Public Health?

The EPA cites “asthma attacks” as one of its key health indicators, suggesting that imposing a stricter ozone standard would reduce asthma attacks, and thereby delivering health benefits. But as noted by the Center for Regulatory Solutions — a project of the Small Business & Entrepreneurship Council — EPA’s own documents show that asthma-related mortality could increase in certain areas if ozone levels decrease.

As Dr. Michael Honeycutt, director of TCEQ’s toxicology division, observed last year:

“Either this indicates that lowering the ozone standard defeats its stated purpose of protecting human health, or it indicates that something is wrong with the EPA’s interpretation of the data. Either way, it’s not a good argument for lowering the ozone standard.”

Honeycutt looked at EPA’s own data sets and found that, in Houston, adjusting the ozone standard to 70 ppb or 65 ppb would result in 48 or 44 more premature deaths, respectively. The reason for this counter-intuitive conclusion is anyone’s guess, ranging from flawed data analysis to an acknowledgment that less economic opportunity can worsen individuals’ health.

Honeycutt’s analysis also included a chart showing the relative health impacts from a variety of outside factors and lifestyle choices. Notably, the health impact from lost employment was far larger than what could potentially be associated with higher ozone levels.



The connection between employment and health is well documented. As the Robert Wood Johnson Foundation has noted, laid-off workers are 54 percent more likely to have fair or poor health than those who are continuously employed, and 83 percent more likely to develop a stress-related condition, including heart disease.

In fact, it was the threat to the economy — and by extension the threat to public health — that caused such intense criticism of EPA’s 2011 ozone proposal. B. Keith Overcash, the air quality director for then-Gov. Bev Perdue (D-N.C.), provided “one of the strongest appeals” for EPA to scrap the rule, according to the New York Times. “Lack of employment, loss of health care, and in some cases, loss of a home, also affect the health of our citizens,” Overcash wrote to EPA in 2011.

A Compliance Nightmare

Another issue of concern for EPA’s new ozone standard is the ability of various regions to comply – or the lack thereof. At the existing standard of 75 ppb, there are many parts of the country that are not in compliance. But as this map from the EPA shows, there would be a considerable number of regions that already exceed the newly-proposed, lower standard:


In a December 2014 presentation, the EPA included this map showing the counties that would be in violation of the agency’s new proposed ozone standards. SOURCE: EPA

Although the map appears to show only a few areas that would be out of compliance, it’s in these same areas where the United States has its highest population density. Curiously, some of the counties projected to be in nonattainment have extremely low population densities, such as those located in national parks.


SOURCE: U.S. Census

Worse yet, according to previous analysis from the EPA, it’s unlikely that these regions will be in compliance with the current standard any time soon.

In 2011, the EPA identified “21 counties (in four geographic areas) that are not expected to attain 0.075 ppm in 2020,” counties that include some of the largest population centers in the United States, such as the Northeastern Corridor, as well as the metropolitan areas of Chicago and Houston — the third and fourth largest U.S. cities, respectively. EPA added that the San Joaquin and South Coast air basins in California weren’t even expected to meet a much higher threshold of 84 ppb until 2024.

Many of these regions have not been in attainment for several decades, but EPA’s claims about the “health benefits” of a lower standard are premised upon these regions coming into compliance. Put differently, the “benefits” for which EPA has computed a monetary value – and used as a justification for a lower standard – are unlikely to materialize.

Nonetheless, in trying to justify its new and more stringent ozone standard, EPA suggests that compliance will be relatively easy:

“Existing and proposed federal rules, including the final Mercury and Air Toxics Standards, the final Tier 3 Vehicle Emissions and Fuels Standards, requirements to reduce the interstate transport of ozone, Regional Haze rules, and the proposed Clean Power Plan, will help states meet the proposed standards by making significant strides toward reducing ozone-forming pollution. EPA projections show the vast majority of U.S. counties with monitors would meet the proposed standards by 2025 just with the rules and programs now in place or under way.”

Notably, the EPA is arguing that its new ozone standard will be easy to comply with, because the laundry list of other expensive regulations that the Agency has already implemented or proposed will also help reduce ozone. But if EPA’s idea of compliance requires the implementation of other rules, then it’s odd that the costs of those rules are not included in EPA’s overall cost-benefit analysis for new ozone standards. The EPA estimates that the Mercury and Air Toxics Standard has a price tag of $9.6 billion per year. The Tier 3 rule “will cost refiners $10 billion in capital costs and $2.4 billion a year in operating costs,” according to the American Fuel & Petrochemical Manufacturers. According to a member of the Federal Energy Regulatory Commission, the cost of the Clean Power Plan alone “could total hundreds of billions of dollars,” in addition to any impacts it may have on the reliability of the U.S. electric grid.

‘Removing Our Nation’s Energy Advantage’

Without a doubt, recent increases in U.S. oil and natural gas production — made possible by technologies like hydraulic fracturing and horizontal drilling — have been a rare and much-needed bright spot in an otherwise bleak economy. Consider:

It’s worth noting that these economic gains have been accompanied by some major environmental benefits as well. The United States leads the world in carbon dioxide reductions — not because it has imposed a carbon tax (as other nations have), but because of the increased use of clean-burning natural gas. Local air pollution, including in states with long histories of pollution problems, is also declining thanks to natural gas, which has led many experts to link natural gas with improved public health.

But by driving up the cost to operate, EPA’s new ozone standards threaten to reduce or wipe out these benefits.

According to NERA Economic Consulting — which the U.S. Department of Energy has previously utilized to estimate the costs and benefits of policy changes impacting energy production — EPA’s proposed ozone rule poses a direct threat to future U.S. energy development. In a report published last summer, which was commissioned by the National Association of Manufacturers, NERA concluded:

“New oil and natural gas production could be significantly restricted in parts of the country classified as ‘nonattainment’ areas, limiting supplies of critical energy resources and potentially driving up costs for manufacturers and households.”

Regarding the impacts on natural gas production alone, NERA found that EPA’s new ozone rule, if it were set at 60 ppb — the low end of the range on which EPA is accepting comments — would:

  • Reduce the present value of GDP by nearly $4.5 trillion through 2040, result in a loss of 4.3 million job equivalents per year and cost households $2,040 annually; and
  • Increase industrial natural gas costs by an average of 52 percent and electricity costs by an average of 23 percent over what they would be if the ozone standard was unchanged.

“Such cost impacts,” NERA added, “could crush the manufacturing comeback by removing our nation’s energy advantage.”

In 2011, even the White House classified EPA’s new ozone standard — then set at 70 ppb — as being among the “regulations that impose significant costs on the private sector.”


One of the main compliance problems for oil and natural gas production comes in areas that have a history of failing to comply with ozone standards, irrespective of any oil and natural gas production activities. This includes the Barnett Shale of North Texas (which underlies part of the Dallas-Fort Worth metropolitan area) and the Eagle Ford Shale (near San Antonio), as well as parts of Utah, Colorado, Wyoming, and Pennsylvania.

In areas classified as “nonattainment,” oil and natural gas producers would likely have to obtain additional permits, or even create offsets for emissions of ozone precursors such as nitrogen oxides (NOx) and volatile organic compounds (VOCs), before it could drill additional wells. These costs could be imposed despite the fact that emissions from oil and natural gas production activities contribute only a small fraction of total ozone precursors, and are dwarfed by other sources such as cars and trucks.

As NERA’s recent study outlined, EPA’s new ozone rule could have a dramatic impact on future U.S. energy production, which would impact the millions of households across the country that have benefited from lower heating costs as a result of affordable natural gas, as well as cheaper gasoline.

With such a massive potential impact on future U.S. energy production — and indeed the entire U.S. economy — EPA’s ozone rule could very well be the costliest regulation ever promulgated. If a rule of this magnitude is to be imposed, then the EPA should have to provide a far more scientifically robust “public health” basis — one that doesn’t rely on what appears to be a dubious inflation of health benefits and a lack of attention to the quantitative and qualitative costs.


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